The main idea behind this post is to learn how to use the foreach statement to go over several items and use an if statement to find a specific item. In the following code, I have a directory that contains several files that I am searching for a specific file.
In the first line of code, I am loading the directory path into an array variable called folder. For example, you need to delete, copy, move files, add or replace lines in all files in the specific directory by some criteria.
To get a list of child objects folders and files in a directory, use the Get-ChildItem PowerShell cmdlet. This is the most popular file system cmdlet. There are several aliases for ChildItem: gci, dir, ls. The foreach statement is known to be a quicker alternative than using the ForEach-Object cmdlet. If foreach is a statement and can only be used in a single way, ForEach-Object is a cmdlet with parameters that can be employed in a lot of different ways.
Like the foreach statement, the ForEach-Object cmdlet can iterate over a set of objects. Only this time, it passes that set of objects and the action to take on each object as a parameter as shown below. Note: To make things confusing, the ForEach-Object cmdlet has an alias called foreach.
Otherwise, in any other context, the code author is probably using the alias for ForEach-Object. One of the newest foreach loops was introduced in PowerShell v4 called a foreach method. This method exists on an array or collection object. The foreach method has a standard script block parameter that contains the actions to take over each iteration, just like the others.
The most significant difference with the foreach method is how it works under the hood. Using the foreach method is considerably faster and is noticeably so over large sets. It is recommended to use this method over the other two if possible. One of the most common uses for a loop in PowerShell is reading a set of servers from some source and performing some action on each of them.
This is a clue right there. This sounds like a great chance to try out the most common PowerShell loop used; the foreach loop. The first task is to create a set of server names in code. The most common way to do that is by creating an array. Lucky for us that Get-Content , by default, returns an array with each element in the array represented by a single line in the text file. Find centralized, trusted content and collaborate around the technologies you use most.
Connect and share knowledge within a single location that is structured and easy to search. How can I change the following code to look at all the. I need to loop through all the files and delete all lines that do not contain "step4" or "step9".
Currently this will create a new file, but I'm not sure how to use the for each loop here newbie. I'd like the output files to either overwrite them, or to have the SAME name, appended with "out". An even easier way to put this is the foreach loop thanks to Soapy and MarkSchultheiss :. If you need to loop inside a directory recursively for a particular kind of file, use the below command, which filters all the files of doc file type.
Other answers are great, I just want to add Note: to be able to use GNUWin32 utils globally you have to add the bin folder to your system path. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Loop through files in a directory using PowerShell Ask Question. Asked 8 years, 4 months ago.
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